Q.Fungus gnat
I have a beautiful large Swiss cheese plant plus others. I recently discovered a rogue that brought in fungus gnat although that plant and I’m afraid others have had to go. The gnats are still here. I’m worried about my beloved plant had her from a baby. Tried tanlin but they still here she’s in a very large pot indoors. Any ideas?

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on March 10, 2020
This article will give you some information and options for control:
https://www.gardeningknowhow.com/plant-problems/pests/insects/fungus-gnats.htm
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